Perhaps a cracked header pin on the original solenoid driver board?
Double check for any cracked header pins and reflow the solder on any that don't look good.
(Topic ID: 279244)
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Check all the connector pins and header pins on :
J3 on the Transformer board
J3 on the Solenoid board - especially pins 13 and 25. The +5vdc is generated on the board, loops out on a wire and back to power the onboard solenoid related logic chips.
Could be a flaky connection on one of those.
Need a solid and constant +5vdc on the solenoid board for any of the solenoids to fire.
If that all checks out, have you measured voltage at the solenoids? Want to see about +43vdc constantly at the solenoids.
Quoted from pinlink:What does low voltage on TP5 point to
TP5 on the solenoid board? +12.8vdc is normal for there, it's listed as +11.9vdc on the schematic.
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